Atari 400 Basic Reference Manual

E
Editing, st:reen, 13 GOTO, 17
Editor, Screen, 24
with conditional branching, 17
END, 9 GRAPHICS, 45
before subroutine, 7
Graphics
End of file, 14 Modes, 46-47
Error messages, B-1 through B-3 Statements, 48
Escape key, 5 COLOR, 48
with Control Graphics Symbols, F-1
DRAWTO, 49
EXP, 33 GET, 45
exp, 5 GRAPHICS, 48
Exponentiation symbol, 6
LOCATE, 48
Expression, 1
PLOT, 49
Arithmetic (see aexp)
POSITION, 49
Logical (see lexp)
PUT, 49
String (see sexp)
SETCOLOR, 50
F filename, breakdown, 27
XIO (Fill), 54
Graphics Control Characters, 56
filespec, 5
H
Usage, 26, 27
Harmony, 57
Fill (XIO), 54
Hexadecimal
FOR/NEXT, 15
/
Decimal Conversion Program, H-18
building arrays and matrices, 42
Hexcode Loader program, 64
with STEP, 15
I
without STEP, 15
INPUT, 25
FRE, 35
Input/Output Commands, 23
Function, 1
CLOAD,
24
Arithmetic
CLOSE, 27
ABS, 33
CSAVE,
24
CLOG, 33
DATA, 28
EXP, 33
DOS, 25
INT, 33
ENTER,
25
LOG, 34
GET,
28
RND, 34
INPUT, 25
SGN, 34
LOAD,
26
SQR, 34
LPRINT, 26
Built-in, 7
NOTE, 26
Derived, E-1
OPEN, 26
Library, 33
POINT,
28
Special Purpose, 35
PRINT, 3, 5, 14, 26
ADR, 35
PUT,
28
FRE, 35
READ,
28
PEEK, 35
SAVE,
29
POKE, 35
STATUS,
29
USR,36
XIO, 29
Trigonometric, 34
Input/Output Devices
ATN, 34
Disk.
Drives (D:), 24
cos, 34
Keyboard (K:), 23
DEG, 35
Line Printer (L:), 23
RAD, 35
Program Recorder (C:), 23
SIN, 35
RS-232
Interface (R:), 24
Screen Editor (E:), 24
G Game controllers
TV Monitor (S:), 24
Keyboard, 59
INT, 33
Joystick, 59
Internal pointer for DATA, 21
Paddle, 59
Input/Output Control Block, 23
Video Graffitti program, H-12 through H-13
Inverse Key, 5
Game controller commands
Invisible graphics cursor, 48-49
PADDLE, 59
IOCB (see Input/Output Control Block)
PTRIG, 59
J
STICK, 59
Joystick Controller, 59
STRIG, 60
GET,
28,49
K
Keyboard (K:), 23
GOSUB/RETURN, 16 ,2 1
Keyboard Controllers, 59
118 Index

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)